CN114963511A - Zero-cold-water heater and control method - Google Patents
Zero-cold-water heater and control method Download PDFInfo
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- CN114963511A CN114963511A CN202110631819.8A CN202110631819A CN114963511A CN 114963511 A CN114963511 A CN 114963511A CN 202110631819 A CN202110631819 A CN 202110631819A CN 114963511 A CN114963511 A CN 114963511A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 639
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000008236 heating water Substances 0.000 claims abstract description 4
- 230000002829 reductive effect Effects 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/18—Water-storage heaters
- F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
- F24H1/201—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/14—Arrangements for connecting different sections, e.g. in water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
- F24H9/2021—Storage heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/18—Domestic hot-water supply systems using recuperated or waste heat
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Abstract
The invention discloses a zero-cold-water heater and a control method, the zero-cold-water heater comprises a heat exchanger, a water inlet of the heat exchanger is connected with a cold water pipe, and the zero-cold-water heater also comprises: the water storage device is provided with a heating module for heating water, and a water inlet is communicated with the cold water pipe; the water mixing valve comprises two water inlets and a water outlet, the two water inlets are respectively connected with the water outlet of the heat exchanger and the water outlet of the water storage device, and the water outlet of the water mixing valve is connected with the water using end; and the control unit acquires the outlet water temperature of the heat exchanger and compares the outlet water temperature with the water temperature set by a user, adjusts the heat exchange efficiency of the heat exchanger according to the comparison result, and/or adjusts the flow proportion of the outlet water of the water storage device and the outlet water of the heat exchanger in the water mixing valve. According to the invention, the water storage device with the heating function is additionally arranged in the water heater, the zero-cold-water function of the water heater can be realized without installing a water return pipeline, and the water heater is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of water heaters, and particularly relates to a zero-cold-water heater and a control method.
Background
Along with the rapid development of social economy, consumers have higher requirements on living quality, the existing gas water heaters generally have the problems of cold water, water cut-off, temperature rise and sudden cold and hot water outlet when water is switched on and off and is combusted, especially when a user takes a shower, the user experience is greatly damaged by the problems, and meanwhile, the waste of water resources is caused by the time of waiting for the water temperature to recover to normal.
In order to solve the above problems, the prior art proposes various zero-cooling water schemes, wherein the most common scheme is to add a water return pipeline outside a hot water pipe and a cold water pipe, but such schemes are only suitable for newly installed and repaired users and reserve the situation of water return. If the water-saving valve is applied to places with only hot water and cold water pipelines, an H valve is required to be installed at a water using end to realize water returning, so that the situation that all water using points use hot water is caused, the pressure of the pipelines is increased after long-term use, old pipelines are broken, and the application range of the water-saving valve is greatly limited.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a zero-cold-water heater and a control method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that:
the first purpose of the invention is to provide a zero-cold-water heater, which comprises a heat exchanger, wherein a water inlet of the heat exchanger is connected with a cold water pipe, and the zero-cold-water heater also comprises: the water storage device is provided with a heating module for heating water, and a water inlet is communicated with the cold water pipe; the water mixing valve comprises two water inlets and a water outlet, the two water inlets are respectively connected with the water outlet of the heat exchanger and the water outlet of the water storage device, and the water outlet of the water mixing valve is connected with the water using end; and the control unit acquires the outlet water temperature of the heat exchanger and compares the outlet water temperature with the water temperature set by a user, adjusts the heat exchange efficiency of the heat exchanger according to the comparison result, and/or adjusts the flow proportion of the outlet water of the water storage device and the outlet water of the heat exchanger in the water mixing valve.
In the above scheme, the water heater adopts the water storage device that is located its inside to provide temperature compensation for the water heater goes out water for whole system does not need return water pipe and also can realize constant temperature water supply, has avoided the defect that zero cold water scheme is difficult for being accepted by the user because of pipeline transformation scheduling problem. And abandon the design of return water pipeline and also reduced the pipeline burden simultaneously, locate the inside water storage device water supply process of water heater and also simplified, need not realize stable constant temperature water supply through the combination of multiple switch valve body and pipeline. The first end of the water mixing valve is connected with the water outlet of the heat exchanger, the second end of the water mixing valve is connected with the water outlet of the water storage device, and the water outlet of the water storage device and the hot water passing through the heat exchanger converge in the water storage device, flow out of the water heater from the third end and are supplied to the water using end. Meanwhile, the water mixing valve can adjust the flow proportion of the first end and the second end according to the electric signal; the water storage device can provide temperature compensation for outlet water of the water heater, and on the other hand, compared with a zero-cold water system only modified by an H valve, the water storage device also plays a certain water pressure buffering role, and greatly prolongs the service life of an old cold and hot water pipeline connected with the water storage device.
The invention provides a further scheme of the zero-cold-water heater, which comprises the following steps: the water heater is characterized in that a first temperature sensor is arranged on the water outlet pipeline of the heat exchanger and used for detecting the water outlet temperature of the heat exchanger, and the water heater is used for adjusting the heat exchange efficiency of the heat exchanger and/or adjusting the flow proportion of the water mixing valve according to the difference value between the water outlet temperature of the heat exchanger and the water temperature set by a user; preferably, the first temperature sensor is arranged close to the water mixing valve, and is used for acquiring the temperature of the water discharged from the heat exchanger and conveyed to the water mixing valve.
In the above scheme, the first temperature sensor transmits the detected temperature back to the control unit of the water heater, and the water heater compares and calculates the real-time outlet water temperature with the water temperature set by the user, so as to adjust the power of the heat exchanger and/or the flow distribution of the water mixing valve. Because the water outlet pipeline of the heat exchanger is at a certain distance from the water mixing valve, in order to prevent the influence of the water temperature stored in the pipeline on the water outlet temperature, the first temperature sensor is preferably arranged on one side close to the water mixing valve, so that the water outlet temperature of the heat exchanger acquired in real time is more accurate.
The invention provides a further scheme of the zero-cold-water heater, which comprises the following steps: and a second temperature sensor is arranged at the water outlet of the water mixing valve, the second temperature sensor detects the confluent water temperature of the heat exchanger and the water storage device, and the water heater selects to continuously adjust the heat exchange efficiency of the heat exchanger and/or the flow proportion of the water mixing valve according to the difference value of the confluent water temperature and the water temperature set by a user or selects to finish the adjustment.
In the above scheme, the water outlet of the water mixing valve is close to the water using end, the second temperature sensor arranged at the water outlet of the water mixing valve can timely acquire the temperature of the converged water, the second temperature sensor sends the information to the control unit, and the control unit judges whether the water temperature meets the water using requirement and determines whether to continue to adjust each part of the water heater according to the water temperature.
The invention provides a further scheme of the zero-cold-water heater, which comprises the following steps: the water storage temperature in the water storage device is always higher than the water temperature set by a user.
In the above scheme, the water storage water temperature is always kept at a higher level (close to or slightly higher than the set water temperature of a user), the water temperature of the water outlet of the heat exchanger and the water storage device converged by the water mixing valve can meet the requirements of the user, and the compensation of the water temperature at the water using end is realized at any time. Under the condition that the water supply of the water heater is in a problem or other faults, the connecting pipeline of the heat exchanger and the water storage device is turned off, and the water storage device can utilize the heating module to heat the water stored in the water storage device and supply the water to the water using end through the water mixing valve.
In the above scheme, the water storage device arranged inside the water heater is limited by the occupied space of the water heater, and has a smaller volume compared with a similar water storage device arranged outside the water using end upstream. Although the water in the water storage device can be preheated, when the temperature is lower in winter and the water heater is started for the first time, the temperature of the low-temperature water in the pipeline from the water outlet of the heat exchanger to the first end of the water mixing valve is greatly reduced by mixing with the water outlet of the heat exchanger, so that the water outlet temperature of the heat exchanger detected by the first temperature sensor is not in accordance with the use requirement. In order to solve the problems, the efficiency of the heat exchanger is further adjusted, when the temperature of the outlet water of the heat exchanger, which is acquired by the first temperature sensor, is greatly lower than the water temperature set by a user, the heat exchange efficiency of the heat exchanger is improved in a short time, so that the low-temperature water retained in the pipeline is heated to a certain degree and then is supplied to the water mixing valve. The improvement of the heat exchange efficiency can be realized by temporarily increasing the power of the burner, so that the water outlet temperature of the heat exchanger is higher than the set water temperature in a short time, and the low-temperature water in the pipeline is neutralized.
The second objective of the present invention is to provide a control method for a zero-cooling water heater as described above, in which the water heater determines whether to adjust the heat exchange efficiency of the heat exchanger and/or the flow ratio of the water mixing valve according to the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user, so that the water body at the water supply end conforms to the water temperature set by the user.
According to the control method, when the outlet water temperature of the heat exchanger is lower than the set water temperature of a user, the difference value between the outlet water temperature of the heat exchanger and the set water temperature of the user is calculated, and the heat exchange efficiency of the heat exchanger and/or the flow proportion of the water mixing valve are/is selected and adjusted according to the numerical range of the difference value.
In the scheme, the comparison result of the outlet water temperature of the heat exchanger and the water temperature set by the user can be subjected to multi-step logic judgment according to the positive and negative or absolute value of the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user, the size relation between the outlet water temperature of the heat exchanger and the water temperature set by the user can be determined through the positive and negative judgment of the difference, and further, the accurate adjustment of single scheme or multi-scheme combination can be further realized according to the numerical value of the difference.
According to the control method, when the water outlet temperature of the heat exchanger is lower than the water temperature set by a user and the difference value is lower than a set value, the flow proportion of the water outlet of the water storage device in the water mixing valve is increased; when the water outlet temperature of the heat exchanger is lower than the water temperature set by a user and the difference value is not lower than the set value, the heat exchange efficiency of the heat exchanger is improved, and the water outlet flow proportion of the water storage device in the water mixing valve is increased.
In the above scheme, due to the difference between the use environment and the application occasion, the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user is not fixed and unchanged, and when the difference is smaller, for example, lower than the set value, the temperature compensation of the outlet water of the water heater can be realized by adopting a single adjusting means. When the difference is large, a plurality of technical means are needed to be combined to realize temperature compensation. The set value is a value preset in the control unit, and can be adjusted by a user or a maintenance worker according to the experience, an instruction manual and the like. In addition, the controllable heating module can always keep the water temperature in the water storage device higher than the water temperature set by a user, and the problem that the water storage temperature is reduced too fast due to too low ambient temperature can be solved.
According to the control method, when the outlet water temperature of the heat exchanger is not less than the water temperature set by a user, the outlet water flow of the water storage device is cut off.
In the above scheme, because the outlet water temperature of the heat exchanger reaches the water temperature set by the user, the hot water in the water storage device is not required to provide temperature compensation, the outlet water flow of the water storage device can be reduced by adjusting the water mixing valve, or the outlet water flow of the water storage device can be directly cut off.
According to the control method, the method specifically comprises the following steps:
s1, judging the water outlet temperature T of the heat exchanger 0 Whether the water temperature is lower than the water temperature T set by the user s If yes, go to step S2, otherwise go to step S4;
s2, increasing the flow proportion of the water outlet of the water storage device in the water mixing valve and/or improving the heat exchange efficiency of the heat exchanger, and then executing a step S3;
s3, judging the confluence water outlet temperature T of the water heater and the water storage device t Whether the water temperature is equal to the water temperature set by the user, if so, executing the step S5, otherwise, returning to execute the step S2;
s4, shutting off the water outlet flow of the water storage device, and then executing the step S5;
and S5, finishing the adjustment.
According to the control method, a step S1' is further included between the steps S1 and S2, and the step S2 is composed of steps S21 and S22, which are as follows:
s1', acquiring the outlet water temperature T of the heat exchanger 0 Difference T with water temperature set by user s Judging whether the difference value is lower than a set value S, if so, executing a step S21, otherwise, executing a step S22;
s21, increasing the flow proportion of the water discharged from the water storage device in the water mixing valve, and then executing a step S3;
and S22, improving the heat exchange efficiency of the heat exchanger, increasing the flow proportion of the water discharged by the water storage device in the water mixing valve, and then executing the step S3.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the zero-cold-water heater provided by the invention adopts the water storage device positioned in the water heater to compensate the temperature of the outlet water of the water heater, constant-temperature water supply can be realized without arranging a return pipeline, and the defect that the zero-cold-water scheme is not easy to accept by users due to the problems of pipeline transformation and the like is overcome;
2. in the zero-cold-water heater provided by the invention, the water storage device can provide temperature compensation for the outlet water of the water heater, and on the other hand, compared with a zero-cold-water system only modified by using an H valve, the water storage device also plays a certain water pressure buffering role, so that the service life of an old cold and hot water pipeline connected with the water storage device is greatly prolonged;
3. in the zero-cold-water heater provided by the invention, the cold water provided by the water supply pipe of the water storage device is used as a water source, and the cold water is heated and converged with the water outlet of the water heater, so that the constant water temperature of the water using end can be ensured in various ways; when the water heater fails or other problems occur, hot water in the water storage device can be temporarily supplied to the water using end to play an emergency role;
4. according to the control method of the zero-cold-water heater, multi-step logic judgment can be carried out according to the positive value, the negative value or the numerical value of the difference value between the outlet water temperature of the heat exchanger and the water temperature set by a user, so that the outlet water temperature of the heat exchanger can be accurately compensated;
5. according to the water heater control method provided by the invention, the heat exchange efficiency of the heat exchanger is improved in a short time according to the temperature of water from the water outlet of the heat exchanger to the first end of the water mixing valve, so that low-temperature water reserved in a pipeline is heated to a certain degree and then supplied to the water storage device; the adverse effect of low-temperature water in the pipeline on the temperature of hot water in the water storage device is avoided.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of the zero cold water heater of the present invention;
FIG. 2 is a logic flow diagram of a control method in embodiment 2 of the present invention;
FIG. 3 is a logic flow diagram of a control method in embodiment 3 of the present invention;
in the figure: the water mixing device comprises a water heater 1, a water storage device 2, a water mixing valve 3, a water mixing valve 31, a water mixing valve first end, a water mixing valve second end 32, a water mixing valve third end 33, a heat exchanger 4, a water using end 5 and a cold water pipe 6.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it for those skilled in the art by reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 3, the present invention provides a zero-cold-water heater and a control method thereof, in which a water storage device is additionally provided in the water heater, so that cold water stored in each pipeline of the water heater is neutralized and converged with hot water in the water storage device, and the heat exchange efficiency of a heat exchanger and/or the flow ratio of a mixing valve are/is cooperatively adjusted, thereby realizing a zero-cold-water function without installing a return pipeline or an H-valve. In the control method, the water heater acquires the outlet water temperature of the heat exchanger and compares the outlet water temperature with the water temperature set by a user, and whether temperature compensation needs to be carried out on the water temperature of the water using end is judged according to a comparison result, wherein the temperature compensation comprises the adjustment of the power of the heat exchanger and/or the flow proportion of the water mixing valve.
Example 1
In this embodiment, as shown in fig. 1, a zero-cooling water heater is provided, which includes a heat exchanger 4, a water inlet of the heat exchanger 4 is connected to a cooling water pipe 6, and further includes: a water inlet of the water storage device 2 is communicated with the cold water pipe 6, and a heating module for heating water is arranged; the water mixing valve 3 comprises two water inlets and a water outlet, the two water inlets are respectively connected with the water outlet of the heat exchanger 4 and the water outlet of the water storage device 2, and the water outlet of the water mixing valve 3 is connected with the water using end 5; and the control unit acquires the water outlet temperature of the heat exchanger 4 and compares the water outlet temperature with the water temperature set by a user, adjusts the heat exchange efficiency of the heat exchanger 4 according to the comparison result, and/or adjusts the flow proportion of the water outlet of the water storage device 2 and the water outlet of the heat exchanger 4 in the water mixing valve 3.
In this embodiment, the water heater adopts the water storage device who is located its inside to provide temperature compensation for the water heater goes out water for whole system does not need return water pipeline also can realize constant temperature water supply, has avoided the defect that zero cold water scheme is difficult for being accepted by the user because of pipeline transformation scheduling problem. And abandon the design of return water pipeline and also reduced the pipeline burden simultaneously, locate the inside water storage device water supply process of water heater and also simplified, need not realize stable constant temperature water supply through the combination of multiple switch valve body and pipeline. The first end 31 of the water mixing valve 3 is connected with the water outlet of the heat exchanger 4, the second end 32 is connected with the water outlet of the water storage device 2, the water outlet of the water storage device 2 and the hot water passing through the heat exchanger 4 are converged in the water storage device and flow out of the water heater 1 from the third end 33 to be supplied to the water using end 5. Meanwhile, the mixing valve 3 can adjust the flow ratio of the first end 31 and the second end 32 according to an electric signal; the water storage device 2 can provide temperature compensation for the water outlet of the water heater 4, and on the other hand, compared with a zero-cold water system only modified by an H valve, the water storage device also has a certain water pressure buffering effect, so that the service life of an old cold and hot water pipeline connected with the water storage device is greatly prolonged.
In this embodiment, a first temperature sensor is arranged on the water outlet pipeline of the heat exchanger 4, the first temperature sensor detects the water outlet temperature of the heat exchanger 4, and the water heater adjusts the heat exchange efficiency of the heat exchanger 4 and/or adjusts the flow proportion of the water mixing valve 3 according to the difference between the water outlet temperature of the heat exchanger and the water temperature set by a user; preferably, the first temperature sensor is arranged close to the water mixing valve 3, and is used for acquiring the temperature of the water discharged from the heat exchanger 4 and conveyed to the water mixing valve.
In this embodiment, the first temperature sensor transmits the detected temperature back to the control unit of the water heater, and the water heater compares and calculates the real-time outlet water temperature with the water temperature set by the user, so as to adjust the power of the heat exchanger and/or the flow distribution of the water mixing valve. Because the water outlet pipeline of the heat exchanger is at a certain distance from the water mixing valve, in order to prevent the influence of the water temperature stored in the pipeline on the water outlet temperature, the first temperature sensor is preferably arranged on one side close to the water mixing valve, so that the water outlet temperature of the heat exchanger acquired in real time is more accurate.
In this embodiment, a second temperature sensor is disposed at a water outlet of the water mixing valve 3, the second temperature sensor detects a confluent water temperature of the heat exchanger 4 and the water storage device 2, and the water heater selects to continuously adjust the heat exchange efficiency of the heat exchanger and/or the flow ratio of the water mixing valve according to a difference between the confluent water temperature and a water temperature set by a user, or selects to finish adjustment.
In this embodiment, the water outlet of the water mixing valve is closer to the water using end, the second temperature sensor arranged at the water outlet of the water mixing valve can timely acquire the temperature of the converged water, the second temperature sensor sends the information to the control unit, and the control unit judges whether the water temperature meets the water using requirement and accordingly determines whether to continue to adjust each part of the water heater.
In this embodiment, the water temperature of the stored water in the water storage device is always higher than the water temperature set by the user.
In this embodiment, the water temperature of the water storage is always kept at a high level (close to or slightly higher than the water temperature set by the user), so that the water temperature of the water discharged from the heat exchanger and the water storage device converged by the water mixing valve meets the requirements of the user, and the water temperature at the water using end can be compensated at any time. Under the condition that the water supply of the water heater is in a problem or other faults, the connecting pipeline of the heat exchanger and the water storage device is turned off, and the water storage device can utilize the heating module to heat the water stored in the water storage device and supply the water to the water using end through the water mixing valve.
In this embodiment, the water storage device disposed within the water heater is generally smaller in volume than a similar water storage device disposed externally upstream of the water usage end, subject to the footprint of the water heater. Although the water in the water storage device can be preheated, when the temperature is lower in winter and the water heater is started for the first time, the temperature of the low-temperature water in the pipeline from the water outlet of the heat exchanger to the first end of the water mixing valve is greatly reduced by mixing with the water outlet of the heat exchanger, so that the water outlet temperature of the heat exchanger detected by the first temperature sensor is not in accordance with the use requirement. In order to solve the problems, the efficiency of the heat exchanger is further adjusted, when the temperature of the outlet water of the heat exchanger acquired by the first temperature sensor is greatly lower than the water temperature set by a user, the heat exchange efficiency of the heat exchanger is improved in a short time, and the low-temperature water reserved in the pipeline is heated to a certain degree and then is supplied to the water mixing valve. The improvement of the heat exchange efficiency can be realized by temporarily increasing the power of the burner, so that the water outlet temperature of the heat exchanger is higher than the set water temperature in a short time, and the low-temperature water in the pipeline is neutralized.
Example 2
In this embodiment, as shown in fig. 2, a control method of the zero-cold-water heater according to embodiment 1 is provided, where the water heater determines whether to adjust the heat exchange efficiency of the heat exchanger and/or the flow ratio of the water mixing valve according to a difference between the outlet water temperature of the heat exchanger and the water temperature set by the user, so that the water body at the water supply end conforms to the water temperature set by the user.
According to the control method, when the outlet water temperature of the heat exchanger is not less than the water temperature set by a user, the outlet water flow of the water storage device is cut off.
In the above scheme, because the outlet water temperature of the heat exchanger reaches the water temperature set by the user, the hot water in the water storage device is not required to provide temperature compensation, and the outlet water flow of the water storage device can be reduced by adjusting the water mixing valve to enable the outlet water to maintain a little higher than the water temperature set by the user, or the outlet water flow of the water storage device is directly cut off.
In this embodiment, the comparison result between the outlet water temperature of the heat exchanger and the water temperature set by the user may be subjected to multi-step logical judgment according to the positive or negative difference value or the absolute difference value, and the positive or negative difference value judgment may determine the relationship between the outlet water temperature of the heat exchanger and the water temperature set by the user, and may be used as a criterion for adjusting the water temperature.
The method specifically comprises the following execution steps:
s1, judging the water outlet temperature T of the heat exchanger 0 Whether the water temperature is lower than the water temperature T set by the user s If yes, go to step S2, otherwise go to step S4;
s2, increasing the flow proportion of the water outlet of the water storage device in the water mixing valve and/or improving the heat exchange efficiency of the heat exchanger, and then executing a step S3;
s3, judging the confluence water outlet temperature T of the water heater and the water storage device t Whether the water temperature is equal to the water temperature set by the user, if so, executing the step S5, otherwise, returning to execute the step S2;
s4, shutting off the water outlet flow of the water storage device, and then executing the step S5;
and S5, finishing the adjustment.
Example 3
In this embodiment, as shown in fig. 3, a further scheme based on embodiment 2 is as follows:
in this embodiment, when the outlet water temperature of the heat exchanger is lower than the water temperature set by a user and the difference value is lower than a set value, the flow proportion of the outlet water of the water storage device in the water mixing valve is increased; when the water outlet temperature of the heat exchanger is lower than the water temperature set by a user and the difference value is not lower than the set value, the heat exchange efficiency of the heat exchanger is improved, and the water outlet flow proportion of the water storage device in the water mixing valve is increased.
In this embodiment, the comparison result between the outlet water temperature of the heat exchanger and the water temperature set by the user may be subjected to multi-step logical judgment according to the magnitude of the positive, negative or absolute value of the difference between the outlet water temperature and the water temperature, and the water temperature may be further accurately adjusted by a single scheme or a combination of multiple schemes according to the magnitude of the difference.
In this embodiment, when the outlet water temperature of the heat exchanger is lower than the water temperature set by a user and the difference value is lower than a set value, the flow proportion of the outlet water of the water storage device in the water mixing valve is increased; when the water outlet temperature of the heat exchanger is lower than the water temperature set by a user and the difference value is not lower than the set value, the heat exchange efficiency of the heat exchanger is improved, and meanwhile, the water outlet flow proportion of the water storage device in the water mixing valve is increased.
In this embodiment, due to differences in use environments and application occasions, the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user is not fixed, and when the difference is small, for example, lower than the set value, the temperature compensation of the outlet water of the water heater can be realized by adopting a single adjustment means. When the difference is large, a plurality of technical means are required to be combined to realize temperature compensation. The set value is a value preset in the control unit, and can be adjusted by a user or a maintenance worker according to the experience, an instruction manual and the like. In addition, the controllable heating module can always keep the water temperature in the water storage device higher than the water temperature set by a user, and the problem that the water storage temperature is reduced too fast due to too low ambient temperature can be solved.
This example differs from example 2 in that: a step S1' is further included between the steps S1 and S2, and the step S2 is composed of steps S21 and S22, which are as follows:
s1', acquiring the outlet water temperature T of the heat exchanger 0 Difference T with water temperature set by user s Judging whether the difference value is lower than a set value S, if so, executing a step S21, otherwise, executing a step S22;
s21, increasing the flow proportion of the water discharged from the water storage device in the water mixing valve, and then executing a step S3;
and S22, improving the heat exchange efficiency of the heat exchanger, increasing the flow proportion of the water discharged by the water storage device in the water mixing valve, and then executing the step S3.
In this embodiment, if the determination at step S3 is no, the process returns to step S1', and the other embodiments of this embodiment are the same as those of embodiment 2.
In the embodiments described above, any process or method descriptions in flowcharts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium. The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a zero cold water heater, includes the heat exchanger, the water inlet of heat exchanger links to each other with the cold water pipe, its characterized in that still includes:
a water storage device, a water inlet is communicated with a cold water pipe, and a heating module for heating water is arranged;
the water mixing valve comprises two water inlets and a water outlet, the two water inlets are respectively connected with the water outlet of the heat exchanger and the water outlet of the water storage device, and the water outlet of the water mixing valve is connected with the water using end;
and the control unit acquires the outlet water temperature of the heat exchanger and compares the outlet water temperature with the water temperature set by a user, adjusts the heat exchange efficiency of the heat exchanger according to the comparison result, and/or adjusts the flow proportion of the outlet water of the water storage device and the outlet water of the heat exchanger in the water mixing valve.
2. The zero-cold-water heater according to claim 1, wherein a first temperature sensor is arranged on the water outlet pipeline of the heat exchanger, the first temperature sensor detects the water outlet temperature of the heat exchanger, and the water heater adjusts the heat exchange efficiency of the heat exchanger and/or adjusts the flow proportion of the water mixing valve according to the difference value between the water outlet temperature of the heat exchanger and the water temperature set by a user;
preferably, the first temperature sensor is arranged close to the water mixing valve, and is used for acquiring the temperature of the water discharged from the heat exchanger and conveyed to the water mixing valve.
3. The zero-cold-water heater according to claim 1, wherein a second temperature sensor is arranged at the water outlet of the mixing valve, the second temperature sensor detects the confluent water outlet temperature of the water storage device and the heat exchanger, and the water heater selects to continuously adjust the heat exchange efficiency of the heat exchanger and/or the flow ratio of the mixing valve according to the difference value between the confluent water outlet temperature and the water temperature set by a user, or selects to finish the adjustment.
4. The zero-cold-water heater according to claim 1, wherein the temperature of the stored water in the water storage device is always higher than the user-set water temperature.
5. The control method of the zero-cold-water heater as claimed in any one of claims 1 to 4, wherein the water heater judges whether the heat exchange efficiency of the heat exchanger and/or the flow ratio of the water mixing valve needs to be adjusted according to the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user, so that the water body supplied to the water using end meets the water temperature set by the user.
6. The control method of the zero-cold-water heater as claimed in claim 5, wherein when the outlet water temperature of the heat exchanger is lower than the set water temperature of the user, the difference between the outlet water temperature of the heat exchanger and the set water temperature of the user is calculated, and the heat exchange efficiency of the heat exchanger and/or the flow ratio of the mixing valve are/is adjusted according to the value range of the difference.
7. The control method of the zero-cold-water heater according to claim 6, wherein when the outlet water temperature of the heat exchanger is lower than the set water temperature of a user and the difference value is lower than the set value, the flow proportion of the outlet water of the water storage device in the water mixing valve is increased; when the water outlet temperature of the heat exchanger is lower than the water temperature set by a user and the difference value is not lower than the set value, the heat exchange efficiency of the heat exchanger is improved, and meanwhile, the water outlet flow proportion of the water storage device in the water mixing valve is increased.
8. The control method of the zero-cold-water heater according to claim 5, wherein when the outlet water temperature of the heat exchanger is not less than the set water temperature of a user, the outlet water flow of the water storage device is cut off.
9. The control method of the zero-cold water heater according to any one of claims 5 to 8, characterized by comprising the following steps:
s1, judging the water outlet temperature T of the heat exchanger 0 Whether the water temperature is lower than the water temperature T set by the user s If yes, go to step S2, otherwise go to step S4;
s2, increasing the flow proportion of the water outlet of the water storage device in the water mixing valve and/or improving the heat exchange efficiency of the heat exchanger, and then executing a step S3;
s3, judging the confluence water outlet temperature T of the water heater and the water storage device t Whether the water temperature is equal to the water temperature set by the user, if so, executing the step S5, otherwise, returning to execute the step S2;
s4, shutting off the water outlet flow of the water storage device, and then executing the step S5;
and S5, finishing adjustment.
10. The method for controlling a zero-cold-water heater according to claim 9, wherein a step S1' is further included between the steps S1 and S2, and the step S2 is comprised of steps S21 and S22, and the following steps are specifically included:
s1', acquiring the outlet water temperature T of the heat exchanger 0 Difference T with water temperature set by user s Judging whether the difference value is lower than a set value S, if so, executing a step S21, otherwise, executing a step S22;
s21, increasing the flow proportion of the water discharged from the water storage device in the water mixing valve, and then executing a step S3;
and S22, improving the heat exchange efficiency of the heat exchanger, increasing the flow proportion of the water discharged by the water storage device in the water mixing valve, and then executing the step S3.
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